增加Tailwind CSS规范

Author: weihongyu12

docs/specification/code/javascript/README.md

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 # JavaScript 规范

docs/specification/code/tailwindcss/README.md

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+---
+sidebar_position: 4
+---
+
+# Tailwind CSS 规范
+
+```js
+// .eslintrc.js
+
+module.exports = {
+  extends: [
+    'plugin:tailwindcss/recommended',
+  ],
+};
+```
+
+:::warning
+截止目前 `eslint-plugin-tailwindcss` 需要 beta 版才支持 Tailwind CSS v4，请执行以下命令安装，并等待最终正式版
+
+```bash
+pnpm add eslint-plugin-tailwindcss@beta -D
+```
+:::
+
+| 规则名称 | 错误级别 | 配置选项 | 描述 |
+|---|---|---|---|
+| [classnames-order](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/classnames-order.md) | warn | - | 使用基于官方推荐顺序的 Tailwind CSS 类名一致排序 |
+| [enforces-negative-arbitrary-values](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/enforces-negative-arbitrary-values.md) | warn | - | 警告使用任意值时带有 `-` 前缀的类名 |
+| [enforces-shorthand](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/enforces-shorthand.md) | warn | - | 将多个 Tailwind CSS 类名替换为其简写形式 |
+| [migration-from-tailwind-2](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/migration-from-tailwind-2.md) | off | - | 检测升级到 Tailwind CSS v3 时的过时类名 |
+| [no-arbitrary-value](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/no-arbitrary-value.md) | off | - | 禁止在类名中使用任意值 |
+| [no-custom-classname](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/no-custom-classname.md) | warn | - | 检测不属于 Tailwind CSS 的类名 |
+| [no-contradicting-classname](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/no-contradicting-classname.md) | off | - | 避免使用相互矛盾的Tailwind CSS类名（例如"w-3 w-5"） |
+| [no-unnecessary-arbitrary-value](https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/no-unnecessary-arbitrary-value.md) | warn | - | 避免使用不必要的任意类名 |